#!/bin/bash

# Copyright (c) 2015-2016 Sandro Mani <manisandro@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE


buildroot="$RPM_BUILD_ROOT"
if [ ! -d "$buildroot" ]; then
  >&2 echo "Invalid buildroot"
  exit 1
fi

# Arguments are passed to elfdeps
elfdepsargs="$@"

# Search for all MPI implementations:
# - Search all modules which start with mpi
# - For each module, store $MPI_DIR -> $MPI_COMPILER and
#   $MPI_COMPILER -> $MPI_LIB in assoc. array
declare -A mpi_compiler_for_dir
declare -A mpi_lib_for_compiler
if [ -e /etc/profile.d/modules.sh ]; then
  . /etc/profile.d/modules.sh;

  # Add moduledirs in buildroot also for cases where an MPI implementation
  # package is being built, meaning that its module files are not yet installed
  IFS=':' read -ra _MODULEPATH <<< "$MODULEPATH"
  for i in "${!_MODULEPATH[@]}"; do
    _MODULEPATH[$i]=$buildroot${_MODULEPATH[$i]}
  done
  export MODULEPATH="$MODULEPATH:$(IFS=:; echo "${_MODULEPATH[*]}")"

  for module in $(module -t avail 2>&1 | grep "^mpi/." | sed "s/(default)$//"); do
    module load $module
    mpi_compiler_for_dir[${MPI_HOME}]=${MPI_COMPILER}
    mpi_compiler_for_dir[${MPI_FORTRAN_MOD_DIR}]=${MPI_COMPILER}
    if [ -n "${MPI_PYTHON2_SITEARCH}" ]; then
      mpi_compiler_for_dir[${MPI_PYTHON2_SITEARCH}]=${MPI_COMPILER}
    elif [ -n "${MPI_PYTHON_SITEARCH}" ]; then
      mpi_compiler_for_dir[${MPI_PYTHON_SITEARCH}]=${MPI_COMPILER}
    fi
    if [ -n "${MPI_PYTHON3_SITEARCH}" ]; then
      mpi_compiler_for_dir[${MPI_PYTHON3_SITEARCH}]=${MPI_COMPILER}
    fi
    mpi_lib_for_compiler[${MPI_COMPILER}]=${MPI_LIB}
    module unload $module
  done
fi

# Read file list from stdin
filelist=`sed "s/[]['\"*?{}]/\\\\\&/g"`

# List requires:
if [ -x /usr/lib/rpm/elfdeps -a -n "$filelist" ]; then
  for file in $(echo $filelist | tr '[:blank:]' \\n); do

    # Get the default requres string from elfdeps
    reqs=$(echo $file | /usr/lib/rpm/elfdeps --requires $elfdepsargs)

    # Check whether the scanned binary is inside a know mpi binary dir
    mpi_comp=
    for mpi_dir in "${!mpi_compiler_for_dir[@]}"; do
      if [[ "$file" == "$buildroot$mpi_dir"* ]]; then
        mpi_comp="${mpi_compiler_for_dir[$mpi_dir]}"
        break
      fi
    done

    # If the scanned binary is inside an mpi dir, for each dependency, check
    # whether the library exists in $MPI_LIB, and if yes, append
    # ($MPI_COMPILER) to each requires string
    if [ ! -z "$mpi_comp" ]; then
      mpi_lib=${mpi_lib_for_compiler[$mpi_comp]}
      for req in $reqs; do
        lib=$(echo $req | grep -Eo '^.*\.so[^(]*')
        if [ ! -z "$lib" ] && ( [ -e "$mpi_lib/$lib" ] || [ -e "$buildroot$mpi_lib/$lib" ] ); then
          req="${req}($mpi_comp)"
        fi
        echo "$req"
      done
    else
      echo "$reqs"
    fi
  done
fi
